Throttle Position Sensor: Adjustments

IDLE SPEED CONTROL & THROTTLE POSITION SENSOR
1. Start and run engine at fast idle to bring coolant to normal operating temperature (185 to 205°F), then turn ignition Off.
2. Ensure all lights, accessories and electric cooling fan are Off, then place transaxle selector lever in Neutral position.
3. Place steering wheel in a straight ahead position.

Fig. 6 Positioning clip in 1 pin connector:

Fig. 7 Grounding 1 pin connector:

4. Loosen accelerator cable, then short 1 pin connector by inserting a paper clip as shown, Fig. 6. Connect a suitable RPM gauge as shown, Fig. 7.
5. Turn ignition switch to Lock position, then remove large harness connector nd small harness connector ``B'' from ECU.
6. Set check switch on ECI checker to Off, then the select switch to ``A.''

Fig. 3 ECI checker:

7. Connect white color connectors labeled ``Checker,'' of harness connector to connectors of ECI checker. Connect harness connector to ECU and harness connector, Fig. 3.
8. Connect a suitable voltmeter to extension terminals of ECI checker, then the change extension switch from ``Check Meter'' down to ``Extension'' position.
9. Set select switch of ECI checker to A, then the check switch to 6.
10. Turn ignition switch On, then hold switch in that position for approximately 15 seconds and check that ISC motor is in its initial position (idle point). Turn ignition switch to Lock position, then disconnect ISC servo connector, then ensure ISC motor is in initial position.

Fig. 8 Fixed SAS location:

11. Open throttle valve halfway two or three times, then release to allow it to snap closed. Loosen fixed SAS as shown, Fig. 8.
12. Start and idle engine, then check idle speed. Idle speed should be 700 RPM.
13. If idle speed is not as specified, adjust ISC adjusting screw until specified idle speed is obtained. When rotating ISC adjusting screw, use the appropriate tool and only make adjustments to specifications in the tightening direction.
14. Tighten fixed SAS until engine speed increases, then loosen until engine speed no longer decreases (touch point). Tighten one full turn from touch point, then stop engine.
15. Turn ignition switch On, then check TPS output voltage. Voltage should be .48-.52 volts. If voltage is not as specified, loosen TPS mounting screw, then rotate TPS to adjust. Rotating TPS clockwise increases output voltage. After adjustment, tighten mounting screws.
16. Set check switch of ECI checker to Off position, then turn ignition switch to ``Lock.''
17. Disconnect connectors of ECI checker and the MPI harness connector A from the ECU and body side harness connectors.
18. Connect body side harness connectors to ECU, then adjust accelerator cable.
19. Connect ISC motor connector.
20. Start engine, then check idle speed.
21. Turn ignition switch Off, then disconnect battery terminal for approximately 5-6 seconds to erase malfunction from diagnosis memory.